Electrician's supply (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">electrician's supply</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wire that I've seen before include "See 2" , "Flex" , "Flexible strands of metal" , "Hand signal; breaker" , "Strand of metal" .)